eXtplorer - PHP-based File Manager

I suggest one central function that queries Joomla version info for all Joomla version.

extplorer.list.php:
global $dir_up, $mosConfig_live_site, $_VERSION;

seems OK: function ext_isJoomla

header.php:
if( is_object( $GLOBALS['_VERSION'] ) || class_exists( 'jversion')) {

list.php:
global $dir_up, $mosConfig_live_site, $_VERSION;

a lot of language files: maybe a simple search&replace solves this

That is all.

All the best wishes to you!